Cooling arrangement for extrusion presses



May 5, 1964 H. PRTT COOLING ARRANGEMENT FOR EXTRUSION PRESSES 5 Sheets-Sheet l Filed June 13, 1958 May 5, 1964 H. PRTT 3,131,814

COOLING ARRANGEMNT FOR EXTRUSION PRESSES Filed June 13, 1958 5 Sheets-Sheet 2 /NVEA/ra@ 2 May 5, 1964 H. PRTT 3,131,814

COOLING ARRANGEMENT FOR EXTRUSION PRESSES Filed June 13, 1958 5 Sheets-Sheet 5 May 5, 1964 H. PRTT 3,131,814

COOLING ARRANGEMENT FOR EXTRUSION PRESSES Filed June 13, 1958 5 Sheets-Sheet 4 Mgy 5, 1964 H. PRTT 3,131,814

COOLING ARRANGEMENT FOR EXTRUSION PRESSES Filed June l5, 1958 nected to and carried by the pistons 8 and being formed with an axial horizontal 'bore passing therethrough. 'Ihe support 7 -xedly carries a :die holder 6 which is ringshaped and which is coaxial with the bore of the container 4, and this die holder 6 carries the extruding die 5. In the position of the parts shown in FIG. l a billet has been extruded from the interior of Ithe billet container v4 through the die 5 into the lform of an elongated metal tube 1'3. Ina manner well known in the art this billet was lirst pierced by a piercing ram 10 which advances axially to `the right, as viewed in FIG. 1, to the position shown in FIG. 1, and while remaining in this position the extrusion ram 9 advances to the right, as viewed in FlG. l, to advance a dun'q'my ring 12 which surrounds the piercing ram 10 'along the latter to the right, as viewed in FIG. 1, so as-to extrude the billet through the die and around the ram which forms a mandrel to determine the interior size of the tube 13. 1 This dummy 12 has an outer diameter slightly less than the inner diameter of the cylindn'calbore of the billet container 4, so that vwhen the tube 13 has been extruded, as shown in FIG. l, there remains in the container 4 an elongated tubular shell and a billet pontion connected to the right end of the shell, this entire portion of the billet which remains in the interior of the billet container 4 at the end of the extnusion process being indicated at 14 in FIG. 1.

When the extrusion of the tube '13 has ended so that the parts have the position shown in FIG. 1, the pistons 8 are advanced to the left to the position shown vin FIG. 2, and in this way the billet container 4 is also advanced tothe left and this causes the shell 14a which adheres to the' inner surface of the billet container to be torn from the stub 14b which remains between the dummy 12 and the die 5. Thereafter, the hydraulic duid is moved so as to advance the pistons 8 to the right to the position shown in FIG. 3, so that the billet container 4 again has the posinon of FIG. l, and simultaneously the rams 9 and 10 are advanced to the lett to the position shown inFIG. 3.

The cooling and ejecting device of the present invention is carried by a rigid arm which is supported for turning movement, for example, so as Y to swing the device k4t) from the position of FIGS. 1 and 2 to that of FIG. 3, or the arm which carries ,the device of the present invention Vmay be guided for Vertical movement from the rest position of FIGS. 1 and 2 to the operating position shown in FIG. 3. In the operating position of FIG. 3 the elongated tubular housing 1 is coaxiaillyarranged between the rams 9 and 10 and the bore of the billet container 4, and with the parts in this position cooling uid is delivered from any suitable source to the opening 15 which leads into the passage2 formed in the wall of the housing 1. At this time the extrusion ram 9 engages and closes the left open end of the housing 1, and it will be noted that the housing 1 is :formed with a cutout 16 adjacent its left open end so that the cooling lluid can fall from the interior oi' the housing 1 through .the passage 16. 'Ihe piercing ram 10 is continuously reciprocated back and Iforth within the housing 1 between 'the solid and dot-dash line position shown in FIG. 3, so that percing ram is very effectively cooled by the cooling iluid which sprays 'from the bores 3 onto the piercing ram.

Simultaneously with this cooling of the piercing ram While the unitary cooling and ejecting means 40 remains in the positionof FIG. 3, the billet container 4 4is ad- Vanced -to the left from the position of FIG. 3 to that of Y FIG. 4, and during this time the left end of the shell 14a is engaged by the ejector member 11 which is removably connected with 'the closed end 1a of the tubular housing 1. Thus, simultaneously with the cooling of the piercing ram 10 the device of the invention cooperates with ythe moving billet container to remove therefrom the shell 14a which remlains after the tube 13 is extruded.

Furthermore, simultaneously with these operations hydnaulic liquid .underv pressure is supplied to la hydraulic struction the ram 9' shearing device 22 which moves upwardly from the position of FIG. 3 to that of FIG. 4 to shear from the left face of fthe die 5 the stub'i14b, and the dummy ring 12 remains in engagement with this stub. In this Way the extmlded tube 13 is finished and can be removed from the extrusion press and at the same time the piencing ram 10 is cooled and the shell 14a is simultaneously removed from the billet-container 4.

Thereafter, the billet container 4 is returned to its starting position shown in FIG. 5 and the combined cooling and eject-ing device of Ithe present invention is moved back to its inoperative position shown in FIG. 5. The press is shown in FIG. 5 in the starting position ready to receive another billet for extruding another tube. Y

It will be noted that the tubular housing 1 is substantially longer than the bore of the billet container 4, `so that the ejector member 11 will be located beyond the right end of the billet container 4, as is apparent from FIG. 4, to guarantee that the entire shell 14a is removed. Furthermore, it will be noted that with the parts in the position of FIG.`3 the structure of the invention forms an extension of the extruding ram 9, so that the distance through which the billet container 4 is required to be moved is substantially less than would be the case if the structure did not form an extension of the ram 9, and thus with this arrangement the structure operates in less time and less hydraulic uid is required toibe delivered to the cylinders which receive the pistons 8 for moving the billet container 4 from the position of FIG. 3 to that of FIG. 4.- Moreover, it will be seen thatwith a horizontal press .which is shown in FIGS. 1-5, the location of the discharge opening 16 for the cooling fluidis such that none of the cooling uid can have access to the interior of the billet container vertical presses, but with such pressesV it is necessary to provide a separate means for guaranteeing that the cooling iluid is removed from the interior of the billet container 4.

In those cases where the billet is extruded n such a way that it does not form a shell 14a, it is unnecessary` by, and thus, there is no restriction asto the amount of cooling fluid or the intensity of the spray which is applied to the reciprocating piercing ram which also need not be iniluenced in its own construction in any way `so as to be cooled by the structure of the invention.

With .the embodiment of the invention -which is illustrated in FIGS. 6 9, the device of the invention is slightly different from that of FIGS. 1-5 in that it includes at its left end a flange 20 which extends beyond the open end of the housing 1 and which forms the discharge passage 16'. The passage 2` is provided with additional bores 3' located at the left end of the. passage 2 for directing the cooling uid to the space which is surrounded by the ange 20. The parts are shown in FIG. 6 in the position which they take when a tube 17 has just been extruded, and it will be noted that with this conis slightly modied so that it slidably engages the interior surface of the billet container 4 so that no shell remains therein.

After the tube 17 has just been extruded so that the parts have the position shown in FIG. 6, the rams 9 and 10 are moved away to the left, and the pistons 8 are also moved to the left so as to locate these parts in the position shown in FIG. 7. Before the rams 9 and 10 and the billet container 4 reach the position of FIG. 7, the combined cooling and ejecting device of the present invention 4. The invention is also applicable to has been moved from the inoperativeposition of FIG. 6 to the operating position of FIG. 7, in the manner described above, and' now the rains 9 and 1t) as Well as the billet container .4 continue to move until'they have the position shown inzFIG'. 7. During this movement .the die 5 adheres to the extruded billet which in itself adheres to the interior of the billet container 4, so that the tube 17 is advanced toward the left through the die carrier 6', and a sawing device 1S is carried by a carriage mounted on the billet containerl, and at this time the carriage is actuated so as to move the sawing device from the position of FIG. 6 to that of FIG. 7 so that the sawing device cuts the tube 17 so that the portion o the latter on the right of Vthe saw represents the nished extruded tube, While the portion 19 represents the portion of the billet which is to be discarded, The parts are shown in FiG, 7 just after the saw device 1S has cut through the extruded tube and moved to the left away from the latter.

The sawing device 18 is now moved on' its carriage back to its rest position Which is shown inA HG. 8, and While cooling iluid is directed from the passage 2 through the bores 3' the pistons 8 continue to advance to the left tothe positionY of FIG. 8 and the billet container 4 also continues to advance to the left, so that the ejector member 11 nally engages the portion v1% of the billet and removes the latter together with the die 5 from the interior of the billet container 4, the parts being shown in -this position inFlG. 8. Simultaneously, the piercing ram is reciprocated back and forth between the solid and the dot-dash line position shown in lJ-G. 8 so that it is effectively cooled, and it will be noted that the lett end of the housing' 1 is so shaped that lit enf'ages the right end of the extrusion ram 9 which is located within the space surrounded almost entirely by the flange 29. The fluid issuing from the left bores 3 of FG. 8 cools the right end of the extrusion ram 9', and the bottomrnost part of the extrusion ram 9', as viewed in PEG. 8, is spaced up- Wardly from the bottommost part of the left opening of the housing 1', which -is to say the lowerrnost part of the right end of the rain is spaced from the lowermost part of the left opening of the housing l', so that the cooling uid within thehousing 1 can escape through the passagel' together with the cooling yfluid Which cools the right end of the ram 9.

The parts are then moved from the position of IG. 8 to that of FIG. 9 Where they arel again ready to receive another billet, and the above operations are again repeated after the billet has been extruded. lt will be noted that with this embodiment, all of the operations performed by the embodiment of FiGS. 1-5 are also performed, and in addition the piercingram 10 itself is also cooled.

The rams 9 and lll are moved from the position of FIGJ6 to that of FIG. 7 as soon as the extruding is completed, so as to reduce as much as possible the tendency of these rams to become heated. The unused portion 19 of the billet is removed from the die 5 at a point .away from the extrusion press, and the die holder 6 is preferably carried by a suitable carriage which enables it to be shifted to a position Where it can receive another die S and then returned to its operating position so that another extrusion cycle may be started.

In those cases where the billet container 4 does not shift along the axis of its bore, the unitary cooling and ejecting means may itself be mounted for, shifting movement, and this may be done simply by connecting its carrier arm on a turnable shaft with which this arm is constrained to turn but along which it is axially movable by any suitable device, so that the device can be axially shifted inthe event that the billet container 4 is not axially shifted. With such a construction the die and its carrier are laterally shiftable in a direction transverse to their common axis to a position which provides a free opening in the support ,7 to receive the portion of the billet which is ejected by the device of the invention.

With the structure of the invention the tnrnable shaft which is connected to the arm which carries the cooling device may be guided for movement along a pair of columns and when the rams have moved to the left from their operation position just beyond the cooling device the latter turns into axial alignment With the rams and a suitable spring device maintains the cooling device in engagement with the right end of the extrusion ram.

Referring new to FIG. 10, the embodiment of the invention which is illustrated therein is capable of cooling the interior of the billet container 4 as Well as performing in the same Way as the other embodiments of the invention. As may be seen from FlG. l0, the device of the invention is shown in position Within the billet housing 4 and the shell 2.4m has just been ejected from the container 4 which is moving to the left at this time, while the piercing ram il) continues to advance to the left and right Within the interior of the housing 1 to be cooled by the cooling liquid which reaches the piercing ram 19 from the bores 5".

With the embodiment of FIG. 10 the housing 1" forms an inner housing and is surrounded by an outer housing 2i which is fixed to the wall of the device which is formed with the passage 2 and Wmch is spaced from the inner housing l so as to define therewith an elongated annular passage 22', and the Wall of the housing 21 is formed with a plurality of bores 24 passing therethrough so that the cooling medium which reaches the space 22 through the inlet Z3 ilows to the right along the space 22 and then discharges through the bores 24 to cool the inner surface of the billet container 4. The bores 24 are inclined so that the cooling iluid issuing therefrom is directed to lett, as viewed in FiG. l0, along the surface of the billet container 4, and in this Way if any portions of the shell 14a remain against the inner surface of the billet container 4, the cooling fluid will remove such portions and they will fall out at theleft end of the billet container 4, as viewed in FlG. l0. i

The device of the invention is provided with an ejector member 1l, as was pointed out above, and this member l," of llG. l0 is fixed to the housing 1 in the manner shown in FlG. l). in the embodiment of FG. 10 the member ll is formed with an annular cutout 25 Which extends axially along the member 1l. through a substantial distance and which communicates with and forms an extension of the space Z2', so that the cooling uid supplied to this space 22' through the inlet 2.3 will also dow into the annular space 25 formed in the ejector member 11". This member lit is furthermore formed With a plurality of radial bores 26 so that the cooling fluid which reaches the space 25 will dov.' outwardly through the bores 26 to the inner surfaceof the billet container 4. It will be noted that the member ll is formed with an annular groove which surrounds the hores 26 and communicates therewith so that the cooling fluid has access to the inner surface of the billet container 4 through this groove, and also it will be noted that just to the left of this annular groove the member il is formed with substantially axial bores which direct the cooling iluid back tov/ard the left open end of the billet container 4, so that the fluid Wln'ch discharges from the bores 2r? joins the uid discharging through the bores 24 and llows With the latter out through the left end of the billet container 4, as viewed in FlG. l0. Thus, with the embodiment of FIG. l0 the device of the invention cools the piercing ram, simultaneously ejects the shell 14a, and simultaneously cools the billet container 4, and furthermore the construction of the ejector element 1l is such that the billet container 4 is cooled even at the portion thereof which is engaged by the ejector member i1".

The billet container 4 is made of a high quality steel and the cooling medium which is supplied to the inner surface of the billet container 4 with the structure of FIG. l0 is preferably compressed air or saturated steam.

FIG, l1 shows one possible embodiment of a structure which mounts the combined cooling and ejecting device 7 ofthe present invention for movement between its rest and operative positions. Referring to FIG. ll,.the unitary means 40 forcooling the structure of theextrusion press as well as for ejecting a portion of a billet which remains-in the billet container after a tube is extruded is iixedly connected with an arm 30 lcarried by a shaft 31 which has an axis parallel to the axis of the rams 9 and 10, and this shaft 31 is supported by any suitable bearings for turning movement about its axis. A chain 33 is supported on any stationary support and carries at its bottom end a hook 34 which engages the armv 30 to .maintain the device in its solid line rest position shown in FIG. 11. When the device is to be moved to its operative position the arm 30 is unhooked from the hook 34 and is allowed to move downwardly by its own weight until the arm 30 engages a stationary stop 32, and at this time the axis of the device 1 coincides with the axis of the rams 9 and which in` the meantimehave been returned to a position distant from the billet container 4 .to an extent suflicient vto provide. between the billet container 4 and the piercing rams 9 and 10 a space sufficient to receive the device ofthe invention therebetween, and then the rams 9 and 10 are advanced to the position indicated in FIG. 3. FIG. l1 also shows a conduit 35 which cornmunicates with the opening and which communicates with'any suitable source of cooling uid to supply this cooling fluid to the device of the `invention. The conduit 35 isin the form of a flexible hose so that the parts are movabler While maintaining the communication between the cooling device and the source of cooling iluid. A similar hose is connected with the inlet 23 of the embodiment of FIG. 10.

ltwillbe understood that each of the elements described-above, or two or more together, may also lind a useful application in lother types .of extrusion presses differing from the types described above.

While the invention has been illustrated and described as embodied in cooling arrangements for extrusion presses, it is not intended to be limited to the details shown, since various modilications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the Iforegoing so fully reveal the gist of the presen-t invention that others can by lapplying current knowledge Areadily adapt it -for various applications without omittingA features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended the meaning yand range of equivalence of .the following claims.

What is claimed as newy and desired to be secured by Letters Patent is:

r1. In anextrusion press for extruding a metal tube from a billet, in combination, a piercing ram,.a coaxial die and a billet container member having a bore axial with the piercing ram, said piercing ram, die and billet contai-ner member [forming part of the extrusion press; a unitary cooling and ejecting means cooperating with said billet container member and piercing ram for cooling said piencing ram after fa metal tube is extruded and for simultaneously ejecting from said ybillet container member the portion of a :billet which remains therein after the metal tube is extruded, said unitary means including an elongated tubular housing member movable to land from an operatingposition located between said piercing ram and billet container member and being coaxi-al with said piercing ram in said operating position, means communicating said housing member for conveying a cooling uid thereto, said housing member having an open end distant from said .billet container member in the operating position of said means and said piercing mam being movable into said housing member through said open end thereof to. be cooled in said housing member, said housing member having a cutout adjacent to said open end 8 Vthereof through which .la cooling duid. escapes from the interior of said housing member, said housingl .member having ran ejector end portion directed toward said. billet container kmember when said. means is in :said operating position thereof; and moving means vcooperating with oneiof'said members iiorV moving the .samesaxially along the other of saidmember sothat said. bore becomes occupied by said housing member to have a billet remaining in said :bore ejected .thererom by saidejector end of said housing member simultaneouslywith the cooling of .said piencingram.

2. In -an extrusion press for extruding a metal tube-from a billet, in combination, a piercing ram, a coaxial die and a billetcontainer having a bore coaxial lwith the piercing ram, said piercing ram, die and billet container forming .part of the extrusion press; a unitary coolingand-ejecting means cooperating with said` billet containerand. piercing ram tor cooling said `piercing ram aliter a metal tube is extruded .and for simultaneously'ejectng trom said billet container. the portion of Ya billet which .remains therein after the metal tube is extrudedlsaid unitary means including an elongated tubular housing movable to u and from an operating position located between said piercing ram land-billet container; and beingv coaxial -witlr said. piercing ram insaid operating position, means communicating with said housing for conveyinga cooling duid/thereto, saidhousing having an ejector end directed toward and an open end distant l.billetcc'mltainer. in the operatingvpositionof said v"unitary ram being movable into said housing through said open end thereof to be cooled vin said housing, said v,housing having a cutout adjacent to said open end thereof through which a cool-ing fluid yescapes from; the .interior of-said housing, and said extrusionpress including 2in/extrusion ram which engages said housing at said open .end thereof when saidhousing is in said operating position; and movhousing while said piercing cooled therein, so that said housing occupies said boreand ejects .said billetportion therefromsim-ultaneously with. the cooling of said piercing ram.

3. In an extrusion press Ifor extra-ding .-a metal .tube l m a billet, in combination, a piercingV ram, a coaxial die anda billet container having a bore coaxial the p1ercing pam, said piercing rann-dieandz billet container forming part of the extrusion press; an elongated tubular housing movable to and from an operatingiposition located between said piercing ram and billet container and Ming coaxial with said piercing ram whensaid housing is said operating position thereof, saidV housing having an open end distant from said billet containerlwhen saidjhousing is in its operating position Iand said piercing ram beingmovable into saidV housing through said `open end thereof, saidhousing open end thereof through which la cooling iluid may es cape from the interior `of said housing; and means communlcating with said housing for supplying Athereto a cooling liuid for cooling said piercing ram |.While the latter is located in said housing. j

4. In an extrusion press for extruding` a metal .tube from a billet, in combination, va piercing ram, a coaxial die and a billet container having a bore coaxial with the piercing ram, said piercing ram, die and billetV container forming part of the extrusion press; an elongated tubular housingv movable to and .from an operating position located between said piercing ram and billet container and being coaxial with said piercing ram when said .housing 1s in saidoperating position thereof, said housing having an open end distant from said billet containerl when said housing is in its operating position and said piercingram being movable into said housing .through said open end thereof, said housing having a cutout adjacent to.said open. end thereof through which a cooling uidmay escape from the interior of'said housing; means communicating with said housing` forsupplying thereto a means and .said piercing mg means moving said billetcontainer axially along said lhaving a cutout adjacenttosad.

cooling uid for cooling said piercing ram While the latter is located in said housing; and ejecting means operatively connected with said housing for movement with the latter to and from said operating position and cooperating with said billet container for ejeeting from the latter the portion of a billet which remains therein after the metal tube is extruded.

5. In an extrusion press for extruding a metal tube from a billet, in combination, a piercing ram, a coaxial die and a billet container having a bore coaxial with the piercing ram, said piercing ram, die and billet container forming part of the extrusion press; an elongated tubular housing movable to and from an operating position located between said piercing ram and billet container and being coaxial with said piercing ram when said housing is in said rJperating position thereof, said housing having an open end distant from said billet container when said housing is in its operating position and said piercing ram being movable into said housing through said open end thereof, said housing having a cutout adjacent to said open end thereof through which a cooling uid may escape from the interior of said housing; means communicating with said housing for supplying thereto a cooling fluid for cooling said piercing ram While the latter is located in said housing; and ejecting means operatively connected with said housing for movement with the latter to and from said operating position and cooperating with said billet container for ejecting from the latter the portion of a billetwhich remains therein after the metal tube is extruded, said ejecting means operating simultaneously with the cooling of said piercing ram in said housing.

References Cited in the tile of this patent UNITED STATES PATENTS 1,948,400 Schlenstedt Feb. 20, 1934 2,337,804 Dempsey Dec. 28, 1943 2,728,453 Thweatt et al Dec. 27, 1955 2,732,066 Albers Ian. 24, 1956 2,778,494 Kreidler Jan. 22, 1957 2,883,049 Arenz Apr. 2l, 1959 2,925,908 Tornblom et al. Feb. 23, 1960 FOREIGN PATENTS 407,858 Great Britain Mar. 29, 1934 636,744 Germany Oct. l5, 1936 71,836 Netherlands Mar. 16, 1953 781,737 Great Britain Aug. 21, 1957 1,029,785 Germany May 14, 1958 

1. IN AN EXTRUSION PRESS FOR EXTRUDING A METAL TUBE FROM A BILLET, IN COMBINATION, A PIERCING RAM, A COAXIAL DIE AND A BILLET CONTAINER MEMBER HAVING A BORE AXIAL WITH THE PIERCING RAM, SAID PIERCING RAM, DIE AND BILLET CONTAINER MEMBER FORMING PART OF THE EXTRUSION PRESS; A UNITARY COOLING AND EJECTING MEANS COOPERATING WITH SAID BILLET CONTAINER MEMBER AND PIERCING RAM FOR COOLING, AND PIERCING RAM AFTER A METAL TUBE IS EXTRUDED AND FOR SIMULTANEOUSLY EJECTING FROM SAID BILLET CONTAINER MEMBER THE PORTION OF A BILLET WHICH REMAINS THEREIN AFTER THE METAL TUBE IS EXTRUDED, SAID UNITARY MEANS INCLUDING AN ELONGATED TUBULAR HOUSING MEMBER MOVABLE TO AND FROM AN OPERATING POSITION LOCATED BETWEEN SAID PIERCING RAM AND BILLET CONTAINER MEMBER AND BEING COAXIAL WITH SAID PIERCING RAM IN SAID OPERATING POSITION, MEANS COMMUNICATING WITH SAID HOUSING MEMBER FOR CONVEYING A COOLING FLUID THERETO, SAID HOUSING MEMBER HAVING AN OPEN END DISTANT FROM SAID BILLET CONTAINER MEMBER IN THE OPERATING POSTION OF SAID UNITARY MEANS AND SAID PIERCING RAM BEING MOVABLE INTO SAID HOUSING MEMBER THROUGH SAID OPEN END THEREOF TO BE COOLED IN SAID HOUSING MEMBER, SAID HOUSING MEMBER HAVING A CUTOUT ADJACENT TO SAID OPEN END THEREOF THROUGH WHICH A COOLING FLUID ESCAPES FROM THE INTERIOR OF SAID HOUSING MEMBER, SAID HOUSING MEMBER HAVING AN EJECTOR END PORTION DIRECTED TOWARD SAID BILLET CONTAINER MEMBER WHEN SAID UNITARY MEANS IS IN SAID OPERATING POSITION THEREOF; AND MOVING MEANS COOPERATING WITH ONE OF SAID MEMBES FOR MOVING THE SAME AXIALLY ALONG THE OTHER OF SAID MEMBER SO THAT SAID BORE BECOMES OCCUPIED BY SAID HOUSING MEMBER TO HAVE A BILLET PORTION REMAINING IN SAID BORE EJECTED THEREFROM BY SAID EJECTOR END OF SAID HOUSING MEMBER SIMULTANEOUSLY WITH THE COOLING OF SAID PIERCING RAM. 